From 2dde1b102866e1928e925678951463f2a7051af1 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Wed, 20 Apr 2016 18:08:20 -0700
Subject: Don't crash when attempting to reduce empty tensors.

---
 unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h')

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h b/unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h
index 6af2d45d4..cd04716bd 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h
@@ -24,9 +24,17 @@ const T2& choose(Cond<false>, const T1&, const T2& second) {
   return second;
 }
 
-template <typename T> EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
+
+template <typename T, typename X, typename Y>
+EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
+T divup(const X x, const Y y) {
+  return static_cast<T>((x + y - 1) / y);
+}
+
+template <typename T>
+EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
 T divup(const T x, const T y) {
-  return (x + y - 1) / y;
+  return static_cast<T>((x + y - 1) / y);
 }
 
 template <size_t n> struct max_n_1 {
-- 
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